Cottonwood County, MN Insulation Payback
Cottonwood County, MN: what topping up your attic actually costs
Cottonwood County sits in IECC climate zone 6 (Cold) — winters that dominate the energy bill, with cooling a minor factor. For a currently uninsulated attic, DOE and ENERGY STAR recommend building up to R-60. Topping up a typical 1,000-square-foot attic from bare joists (R-2) to R-60 runs an estimated $3,480, and saves about $2,110 a year in heating and cooling — a payback around 1.6 years. That's about as fast as attic paybacks get.
The breakdown behind the number
The estimated savings split roughly $1,979/year heating, $131/year cooling. Out of every 100 US counties tracked here, Cottonwood County's savings potential beats roughly 87 of them. Within zone 6 specifically, it ranks 285th of 459 counties by estimated savings. Minnesota averages $2,366/year across the counties tracked here; Cottonwood County comes in 11% lower.
Where these numbers come from
NOAA's WINDOM, MN US station, 9.8 miles from Cottonwood County, supplies the 7,402 HDD and 813 CDD this estimate runs on. That combined heating-and-cooling load ranks Cottonwood County 378th nationally by total degree days — the 88th percentile. Cottonwood County falls in DOE's moisture regime A (humid), a detail that affects vapor-barrier recommendations more than the R-value target itself.
The smaller top-up scenario
Already have a few inches up there? Topping R-11 up to R-49 runs about $2,280 for about $308/year saved — roughly 7.4 years to break even. That is a solid payback as home upgrades go.
Quotes and materials for this job
Actual quotes will vary by attic access, existing debris, and whether the job needs air sealing first. Treat the $3,480 figure above as a planning number for Cottonwood County, not a bid - contractors typically charge a $600 minimum regardless of job size.
Nothing here is a guess
Every figure on this page traces to DOE/IECC climate zones and NOAA degree-day normals, documented in the methodology guide. The guide to what R-value actually means explains why R-60 is the target here specifically.